I'll state a few obvious ones
"50 percent" from Ballroom
"Mama, A Rainbow" from Minnie's Boys
"I Do not know a Day I did not Love You" from Two by Two (also partial to "The Golden Ram" from that show)
"If i Have to live alone" from Baker's Wife
"When you're a gay man, you have to feel good about yourself when a urologist says, "Yeah. I pick you". - Happy Endings